Nix flake with a pre-configured dev shell for python

1. Install nix:

sh curl -L <https://nixos.org/nix/install> | sh -s -- --daemon

2. Enable flakes feature:

mkdir -p ~/.config/nix
echo "extra-experimental-features = nix-command flakes" >> ~/.config/nix/nix.conf

3. Clone this repo.
4. Launch the dev shell:

nix develop